Question

Differentiate between audible and inaudible sounds.

Answer 1

Hint: Sounds are vibrations produced in air which travel from one point to the other. It requires a medium to travel. Sound has many properties which helps us in distinguishing between different sounds. One such property is frequency. It is the number of vibrations completed per second.

Complete answer:
Sounds are nothing but vibrations in the air picked up by our ears which are then converted to electrical signals in our brain.
The sound vibrations are a series of compressions and rarefactions. It requires a medium to travel from one place to the other. It travels fastest in solids.
Sound has various properties which enables us to distinguish between different sounds.
Frequency is one such property. Frequency is the number of vibrations completed in one second. Its SI unit is Hertz (Hz). The range of sound is between 20 Hz to 20,000 Hz. This means that the sounds having frequency between the ranges of 20-20,000 Hz only can be heard by humans, other sounds with frequency below 20 Hz and above 20,000 Hz cannot be heard by an average person
The sounds which can be heard by humans having frequency in the range of 20 Hz to 20,000 Hz are called audible sound. While, the sounds which cannot be heard by an average person having frequency less than 20 Hz and more than 20,000 Hz are called inaudible sounds.

Note:
The other properties of sound include amplitude; the more the amplitude, the louder is the sound and vice versa, pitch; high frequency sounds are high-pitched and vice versa, timbre; it distinguishes between two instruments playing the same notes, velocity; the speed at which sound travels in a medium.